On-air challenge: Today's puzzle is called "P.E. Class." Every answer is a familiar two-word phrase or name in which the initials are P.E.

A collection of tools for people looking to make their own puzzles. By Isaac Aronow Some constructors still use graph paper and an expansive collection of dictionaries, but most use software.

On-air challenge: School is back, and today I've brought a game of Categories based on the word TEACH. For each category I give, name something in it starting with each of the letters T-E-A-C-H. For ...